Accordion



April 12, 1932; CAGNAZZO 1,853,799

ACCORDION Filed March 19, 1930 INVENTOR, 1 540 C46; 4220 Patented Apr.12, 1932 UNITED STATES PATENT OFFICE ANGELO CAGNAZZO, OF SAN FRANCISCO,CALIFORNIA ACCORDION Application filed March 19, 1930. Serial No.437,009.

This invention relates to improvements in accordions.

It is one of the objects of the invention to provide a silencermechanism tosilence one of the reed blocks of an accordion, or render itoperative at will, the mechanism being adapted to be actuated by acomparatively short hand stroke of the player, longitudinally to thekey-board and always in the same If direction, regardless whether thereed block is being silen'cec, or opened; furthermore, the

mechanism may be operated at any point on the key-board without removingthe hand y from the keys of the accordion.

if Another object of the invention is to provide a hand plat-e slidablealongside the edge of the key-board of the accordion, and provided withlongitudinally spaced projections to be engaged by the hand of theplayer at c any point of the key board; the hand plate being soconnected to a slidable reed block silencer, that the silencer is movedeither into or out of the reed block by the movement of v the handplate, in one and the same direction;

the hand plate being automatically returned mechanism, thus leaving thesilencer in position in spite of the return movementor" the plate.

Other objects and advantages are to provide an accordion that will besuperior in point of simplicity, inexpcnsivencss of construction,positiveness of operation, and facility and convenience in use andgeneral efliciency.

In this specification and the annexed drawings, the invention isillustrated. in the form considered to be the best, but it is to beunderstood that the invention is not limited to such form, because itmay be embodied in other forms; and it is also to be understood that inand by the claims following the description, it is desired to cover theinvention in whatsoever form it may be embodied.

The invention is clearly illustrated in th accompanying drawings,wherein Fig. 1 is a perspective view of an end of the accordion, showingthe bottom face of the key-board and the reed boxes, the bellows beingremoved.

Fig. 2 is a face view of the hand plate as mounted on the edge of thekey-board.

Fig. 3 is a fragmental View of the keyboard end of the accordion,showing the silencer actuating mechanism.

Fig. at is a sectional view of the one way operative connection betweenthe shaft of the silencer actuating mechanism and the rack and pinionmechanism that is operated by the hand plate, the section being taken onthe line 4-4 of Fig. 3.

Fig. 5 is a sectional view of the eccentric silencer actuator, thesection being taken on the line 55 of Fig. 3.

Fig. 6 is a i'ragmental sectional view of the silencer in the reedblock, the section being taken on the line 66 of Fig. 1.

Fig. 7 is a fragmental sectional plan view showing the crank pinoperating the silencer, the section being taken on the line 7-7 of Fig.6; and

Fig. 8 is a sectional View of the connection of the silencer actuatingeccentric to the rack operated disc, the section being taken on the line88 of Fig. 3.

The function of a silencer in an accordion is to render silent the reedsin one or more of the reed blocks of an accordion, by closing the airpassages leading into the said reed block. For this purpose the airopenings of the reed block are to be covered or uncovered at will. Suchsilencing is used particularly in the accordion in connection with oneof the reed blocks that produces a sound an octave lower than the oth rreed blocks. Some of the previous attempts to operate a silencer forthis reed block, have provided actuating mechanisms which necessitatethe removal of the hand from the keys, others need a hand stroke in onedirection to cause the covering of the air openings of the reed block,and the movement of the hand in the opposite direction to cause theuncovering of said openings. The removal of the hand from the keyboardresults in losing time and count in the music. The back and forthmovement of the hand results in confusion and loss of time,

because the player is usually unable to keep in mind the last positionof the actuating mechanism, and of the direction of the next stroke tooperate the silencer.

In the construction hereinafter described, I provide a silenceractuating mechanism, the operation of which does not require the removalof the hand from the keys of the accordion, and which is operated byhand movements in the same direction, regardless whether the silencer isto be moved into or out of the reed block. After each actuation of thesilencer the outer operating mechanism is automatically returned to itsoriginal position, leaving the silencer in the adjusted position, andthe subsequent manipulations of the outer operating mechanism are allperformed in one direction only.

In carrying out my invention I make use of the end plate 6 of theaccordion, from an edge of which angularly extends the usual key-board7, on which in turn are located the accordion keys in the customarymanner. On the inner face of the end plate 6 are mounted reed blocks 8containing the vibrating reeds. A flow of air passes thru openings 9,when ever the usual bellows of the accordion is manipulated.

In order to render a reed block silent, or inoperative the air openings9 thereof are to be covered. For this purpose a silencer plate 11 isutilized. The silencer plate is slidable in a longitudinal slot 12 atthe air openings 9 and has apertures 13 thereon disposed to registerwith the air openings 9, when the silencer 11 is partly withdrawn fromthe slot 12. lVhen the silencer 11 is moved into the slot 12 of therespective reed block 8, then the apertures 14 are advanced into theclosed 3 spaces between the adjacent air openings 9,

and the solid portions of the silencer 11 cover the openings 9 toprevent the passage of air therethrough, whereby the respective reedblock 8 is rendered inoperative.

The silencer 11 is moved into and out of the reed block 8 by a silenceractuating mechanism 16, which in turn is operated by an operatingmechanism 17. The two groups of mechanisms 16 and 17 are so connected toeach other that the operating mechanism 17 is operative only in onedirection, and is antomatically returned in the other direction withoutengaging the actuating mechanism in this latter direction. The operatingmechanism 17 is connected to the inner face of a hand plate 18 which isslidable alongside the longitudinal edge 19 of the keyboard 7. Thesilencer 11 is moved either into or out of the reed block 8 whenever-thehand plate 18 is moved downwardly, viewing F 1g. 1 of the drawings.

The hand plate 18 is slightly shorter than the edge 19, however itextends substantially the entire length of the row of keys on thekey-board, so that it may be engaged by the hand or palm of the player,at any point of the length of the key-board. To facilitate themanipulation of the hand plate 18 a plurality of longitudinally spacedtransverse projections or ribs 21 are provided on the outer faces of thehand plate 18. which are readily engageable by the hand. The hand plate18 is guided and held on the keyboard edge 19 by means of pins 22extending from the inner face of the hand plate 18 into longi tudinalguide slots 23 in the edge 19.

The operating mechanism 17 includes a shaft'24 rotatably supportedwithin the keyboard 7 and extends transversely from the outer edge 19 tothe interior of the accordion. On the outer end of the shaft 24 is acrank lever 26, the free end of which abuts against a pin 25 extendingfrom the rear or under face of the hand plate 18, so that thereciprocating movement of the hand plate 18 is conveyed thru the lever26 and is converted into rotary motion of the shaft 24 and transmittedto another crank lever 27 on the inner end of the shaft 24, and viceversa. A right angle bracket 28 is secured on the inner face of theinner end of the key-board 7. In this bracket 28 is rotatably supporteda stub shaft 29, on which in turn is rotatable an annular disc 31. Onthe face of the disc 31 adjacent the key-board 17 is fixed a pinion 32,with which is meshed a rack 33, the latter being guided and held inmeshing position by means of a flange 34 of the bracket 28. It is to benoted that the rack 33 reciprocates parallel to the key-board 7. From anend of the rack 33 projects at right angles, a U- shaped hook 36 withwhich the free end of the lever 27 is engaged. To the other end of therack 33 is attached an end of a coil spring 37, the other end of whichlatter is secured to the key-board 7. It is to be noted that the levers26 and 27 extend at substantially 180 relatively to each other,therefore when the hand plate 18 is moved downwardly, view ing Fig. 1,the rack 33 is moved oppositely, or upwardly by the lever 27. The rack33 is moved by the hand plate 18 against the action of the spring 37,and during its movement it rotates the pinion 32 and the disc 31therewith. WVhen the hand plate 18 is released the spring 37 urges therack 33 back to its original position, whereby the plate 18 is returnedto its starting position, and the disc 31 is rotated in the oppositedirection.

The disc 31 is connected to the shaft 29 by means of a pawl 38 and aratchet wheel 39, the latter being keyed to the shaft 27. The pawl 38 ispivoted on the face of the disc and is urged against the periphery ofthe wheel 39 by means of a spring 41. It is to be noted that the ratchetwheel 39 is formed in the shape of a cam with two diametrically oppositeteeth to be engaged by the pawl 38. when the disc 31 is rotated incontra-clockwise direction, viewing Fig. 4. When the disc 31 is rotatedin the opposite direction the pawl 31 slips or rides on the periphery ofthe wheel 89 without rotating the same. The silencer actuating mechanism16 is operated through the shaft 29, therefore it is actuated only whenthe disc is rotated in said contra-clockwise direction. In other words,movement is transferred to the actuating mechanism 16 only when the handplate 18 is moved downwardly, viewing Fig. 1, during the return movementof the hand plate 18, the shaft 29 is not rotated, and the actuatingmechanism 16 remains in its adjusted position.

The shaft 29 is rotated always in the same direction, but the silencer11 must be moved successively in opposite directions. In order tooperate the silencer 11 successively in 01- posite directions, aneccentric a2 is lined on the shaft 29, to the eccentric band d8 of whichis attached a connecting rod 4s. The free end of the connecting rod 1 1is pivotally secured to the free end of a lever 46 extending at rightangles to a crank pin 45?, which is journaled in bearings 48 on theinner of the end plate 6 of the accordion. be noted that the connectingrod e c 7 alongside one of the end reed blocks 8 substantially inparallelism therew L l of the block, while the crank uin 17 posed acrossopposite ends of the blo substantially at right angles to the rod L Theouter end of the silencer 11 is formed in a Ushaped hook e9 to engagethe cr lk of the pin 17 and be reciprocated thereby as the pin 47 isrocked. his the eccentric rotated the connecting rod 1- 1 isreciprocated to rock the pin 17 and slide the silencer 11 into and outof the slot 12 in the respective reed block 8. It is to he noted themechanisms are so adjusted that the rod i, stopped at the ends of itsrespective up and down strokes, viewing Fig. 1. The length of thelongitudinal slot 28 is such that it limits the down movement of thehand plate 18, to a stroke corresponding to a half revolution of thedisc 31, so that the eccentric 12 is moved 180, from the full lineposition to the dotted line position shown in Fig. 5. Each of thesuccessive full manipulations of the plate 18 in one direction, alwaysaccomplishes a full stroke of the rod 4%, resultingin the propermovement of the silencer 11 to cover or uncover the air openings 9. Theautomatic re turning of the hand plate 18 by the action of the spring 37leaves the position of the silencer 11 unaffected. Hence the player ofthe accordion noes not have to move the hand plate back and forth.Furthermore, the hand plate 18 may be readily engaged and operated by aslight hand movement alongside the edge of the key-board at any pointrelatively to the row of keys, without necessitating the removal of thehand from the key The afore-described silencer or dampener mechanism isconnected to one set of reed blocks 8. In some instances it is desirableto dampen or silence another set of reeds. In order to allow theindependent silencing of the different sets of reed blocks, I provideanother silencing mechanism denoted in its entirety by the numeral 51,which operates silencers 11 in the second set of reed blocks 8. Themechanism 51 is similar to the first described mechanism except that theshaft 21 thereof has a crank lever 26 on the outer end thereof extendingat substantially right angles to the crank lever 26. A. pin 25 on theinner face of the plate 18 abuts against the lever 26 only when theplate 18 is moved upwardly, beyond the return or release position of thefirst crank lever 26. The opera ing mechanism 51 includes all theclements described in connection with the first described mechanism, andoperates similarly, except that the pawl 88 and ratchet 29 in the secondmechanism, are reversed, that is, arranged to be operated by the shaft24 when the latter is rotated in a direction opposite to the operativedirection of the shaft 2d.

Consequently when the plate 18 is moved downwardly, viewing Fig. 1, theshaft 24 is rotated to operate one set of silencers, but the pin 25moves away from the crank lever 26" leaving the latter free andinoperative. When the plate 18 is automatically returned to its neutralposition, then the crank lever 26 is turned by the pin 25, but the pin25 merely moves into abutting relation to the crank lever 26. On theother hand, when the plate 18 is moved upwardly from its neutral orreleased position, the pin 25 turns the crank lever 26 to actuate theother set of silencers, at the same time the pin 25 is moving awayinoperatively from the crank lever 26. Thus a single movement in onedirection operates only one set of silencers, after which the plate 18is automatically returned to its neutral position by the respectiveoperating mechanism; and a single movement of the plate 18 in theopposite direction operates only the other set of silencers, the plate18 being automatically returned to its neutral position by the otheroperating mechanism. In this manner each silencer is actuated by asingle movement, always in the same direction for the same silencer andby moving the plate 18 into its opposite extreme position, both oisilencers are operated, and the released plate 18 is returned to itsneutral position by the last actuated operated mechan1sm.

Having thus described this invention, what I claim and desire to secureby Letters Patcut is:

1. The combination with an accordion having reed blocks with airopenings thereon, and a key-board, of a hand plate slidable alongsidethe longitudinal edge of the keyboard, a silencer slidable over the airopenings to silence one of the reed blocks; an actuating mechanismconnected to the silencer to slide the same to cover and uncover saidopenings; and means extended thru the key-board and connected to theplate, to operate the actuating mechanism in either direction by thesliding of the plate in one direction and to automatically return theplate in the other direction without operating the actuating mechanism.

2. The combination with an accordion having reed blocks with airopenings thereon, and a key-hoard, of a hand plate slidable along sidethe longitudinal edge of the key-board, a silencer slidable over the airopenings to silence one of the reed blocks; an actuating mechanismconnected to the silencer to slide the same to cover and uncover saidopenings; and means extended thru the key-board and connected to theplate to operate the actuating mechanism successively in oppositedirections by successive movement of the plate in one direction and toautomatically return the hand plate from its operative position aftereach actuation, Without operating the actuating mechanism.

3. The combination with an accordion having reed blocks with airopenings on each reed block, and a key board, of a hand plate slidablealongside the longitudinal edge of the key-board, being slightly shorterthan the said longitudinal edge, a plurality of spaced transverseprojections extending outwardly from the slide handle to be engaged bythe hand of the player, a silencer slidable over the openings of one ofthe reed blocks to render said reed block inoperative; means connectingthe silencer to the hand plate to move the silencer into or out ofsilencing position upon the sliding of the plate in one direction, andmeans to automatically move the hand plate in the opposite direction,when the same is released, without moving the si lencer.

4; The combination with an accordion having reed blocks with airopenings on each reed block, and a key-board, of a hand plate slidablealongside the longitudinal edge of the key-board, being slightly shorterthan the said longitudinal edge, a plurality of spaced transverseprojections extending outwardly from the slide handle to be engaged bythe hand oi" the player, a silencer slidable over the openings of one ofthe reed blocks to render said reed block inoperative; a silenceractuating mechanism; and means to operatively connect the actuatingmechanism to the hand plate, when the same is moved in one direction,and to automatically move the plate in the released position thereofindependently of the actuating mechanism.

5. The combination with an accordion having reed blocks with airopenings thereon, and a key-board, of a hand plate slidable successivelyin the same direction from a normal position of rest alongside thelongitudinal edge of the key-board, a silencer slidable in oppositedirections to cover and uncover the air openings in one of the reedblocks; a single continuous actuating mechanism connected to the handplate and to the silencer to slide the silencer to cover the airopenings when the hand plate is moved in one direction from a normalposition and to uncover the openings when moved in the same directionfrom said normal position, said hand plate being flat and parallel iththe said edge of the keyboard; and a plurality of longitudinally spacedprojections extended outwardly from the hand plate to be engaged at willby the hand of the player.

6. The combination with an accordion having reed blocks with airopenings on each reed bloch, and a key-board, of a hand plate slidablealongside the longitudinal edge of the key-board, being slightly shorterthan the said longitudinal edge, a plurality of s accd transverseprojections extending outwardly from the slide handle to be engaged bythe hand of the player, a silencer slidable over the openings of one ofthe reed blocks to render said reed block inoperative, said opei tingmeans comprising a crank transiy disposer in the key-board having an endthereof connected to the hand plate, a 1 'l pinion mechanism on theinside of the y-board adapted to engage the actuatmechanism when movedin one direction oy the hand plate, and resilient means to automaticallyreturn the said rack and pinion mechanism and said hand plate intoinoperative position independently of the actuating mechanism.

7. The combination with an accordion having reed blocks with airopenings thereon, and a key-board, of a hand plate slidable alongsidethe longitudinal edge of the keyboard, a silencer slidable over the airopenings to silence one of the reed blocks; an actuating mechanismconnected to the silencer to slide the same to cover and uncover saidopenings; means extended thru the keyboard. and connected to the plateto operate the actuating mechanism in either direction by the sliding ofthe plate in one direction and to automatically return the plate in theother direction without operating the actuating mechanism, saidoperating means comprising a crank transversely disposed in thekey-board having an end thereof connected to the hand plate, a rack andpinion mechanism on the inside of the key-board adapted to engage theactuating mechanism when moved in one direction by the hand plate, andresilient means to automatically return the said rack and pinionmechanism and said hand plate into inoperative position independently ofthe actuating mechanism.

8. The combination with an accordion having reed blocks with airopenings thereon,

and a key-board, of a hand. plate slidable alongside the longitudinaledge of the keyboard, a silencer slidable over the air openings tosilence one of the reed blocks; an actuating mechanism connected to thesilencer to slide the same to cover and uncover said openings; meansextended thru the keyboard and connected to the plate to operate theactuating mechanism in either direction by the sliding of the plate inone direction and to automatically r turn the plate in the otherdirection, without operating the actuating mechanism, said actuatingmechanism comprising a crank pin journaled above the reed blocks andengaged with the silencer to move the same; a connecting rod connectedto the crank pin to rotate the same, and an cecentric to reciprocate theconnectin rod, said eccentric being turned a halt a revolutioneverytimethe hand plate is slid in one direction and remainingstationary when the hand plate is released and returned in the otherdirection.

9. In an accordion having reed blocks with air openings thereon and akey-board; a hand plate slidable alongside the longitudinal edge of thekey-board, a silencer slidable over the air openings to silence one ofthe blocks, a crank pin journaled adjacent the reed blocks to move thesilencer into and out 03": silencing position; an eccentric adjacent theside of one of the reed blocks connected to the crank pin to rock thepin succesriively in opposite directions; operating means connecting theeccentric to the hand plate to tur' the eccentric as the hand plate isslid in one direction, and to release said eccentric the hand plate isreturned in inoperative position in the other direction; and resilientmeans to automatically return said operating means and said hand plateto the inoperative position.

'10. In an accordion having reed blocks with air openings thereon and akey-board; a hand plate slidable alongside the longitudinal edge of thekeyboard, a silencer slidable over the air openings to silence one ofthe reed blocks, a crank pin journaled adj acent the reed blocks to movethe silencer into and out of silencing position; an eccentric at jacentthe side of one of the reed blocks connected to the crank pin to rockthe pin suciessively in opposite directions a crank transverselyjournaled in the key-board having 11 end thereof connected to the handplate, a rack slidable on the inner end of the keyboard and beingconnected to the other end of the crank; a rotary disc mounted on theinside of the key-board, a pinion lined concentrically on the discmeshing with the rack, a ratchet wheel on the shaft of the eccentric,and a pawl pivoted on a face of the disc to engage said ratchet wheelwhen the disc rotated in one direction by the sliding oi the plate, andresilient means to automatically return said rack and said hand plateinto a released position rotating the disc in the opposite directionfreely from said ratchet.

11. In an accordion having reed blocks with air openings thereon and akey-board; a hand plate slidable alongside the longitudina l edge f thekeyboard, a silencer slidable over the air openings to silence one ofthe reed blocks, a crank pin urnaled adjacent the reed blocks to movethe silencer into and out silencing position; an eccentric adjacent theside of one of tee reed blocks connected to the crank pin to rock thepin successively in opposite directions; a crank transrersely iournaledin the key-board having an end thereof connecteo to the hand plate, arack slidable on the inner end of the key-board and being connected tothe other end of the crank; a rotary disc mounted on the inside of thekey-hoard, a pinion fixed concentrically on the disc meshing with therack; coacting elements on the disc and on the eccentric to cause theturning of the eccem-ric as the disc is rotated in one direction by thesliding of the hand plate, and to allow the tree rotation of the disc inthe other direction as the rack and the hand plate are returned in theopposite direction; and resilient means to automatically return saidrack and said hand plate to the starting position thereof after eachactuation of the silencer.

li The combination with an accordion having reed blocks "ith airopenings thereon and a key board, or" a hand plate slidahle on an edgeof the keyboard; a silencer slidablc over the air openings of one of thereed blocks, a second silencer slidable over the air openings of anotherreed block, an actuating mechanism connected to the first silencer to side the same to cover and uncover the respective openings; a secondactuating mechanism connected to the second silencer to slide the sameto cover and uncover the openings of the second rec l bl, and means. toreach actuatmechanism, extended thru the keyboai a to connect therespective actuatin mechanism to the plate, to operate only one or saidmechanisms every time the plate is moved in one direction from itsneutral position, and to opcrate only the other mechanism every time theplate is moved in the opposite direction beyond its neutral position,each or said me ch anisins being adapted to automatically return theplate to its neutral position after each operation.

13. The combination with. accordion *i reed blocks with air openingsthereon d a :eyboard, 01" a hand plate sridable on longitudinal edge ofthe ke board alone;- ide the keys of the keyboard, a silencer slidxbleover the air openings 0t one of t .Jlocks, seconc silencer slidable overopenings of another reed block, an actuatin mechanism connected to thefirst silencer to slide the same to cover and uncover the respectiveopenings; a second actuating mechanism connected to the second reedblock; and means, for each actuating mechanism extended thru thekeyboard to connect the respective actuating mechanism to the plate, tooperate only one of said mechanisms every time the plate is moved in onedirection from its neutral position, and to operate only the othermechanism every time the plate moved in the opposite direction beyondits neutral position, each of said mechanisms being adapted toautomatically return the plate to its neutral position after eachoperation.

14. The combination with an accordion having reed blocks with airopenings there on and a keyboard, of a hand plate slidable on alongitudinal edge of the keyboard alongside the keys of the keyboard, asilencer slidable over the air openings of one of the reed blocks, asecond silencer slidable over the air openings of another reed block, anactuating mechanism connected to the first silencer to slice the same tocover and uncover the respective openings; a second actuating mechanismconnected to the second reed block; means, for each actuating mechanismextended thru the keyboard to connect the respective actuating mechanismto the place, to operate only one of said mechanisms every time theplate is moved in one direction from its neutral. position, and tooperate only the other mechanism every time the plate is moved in theopposite direction beyond its neutral position, each of said mechanismsbe ing adapted to automatically return the plate to its neutral positionafter each operation, said means of connection being disposed entirelywithin the keyboard, and means on the said edge of the keyboard slidablyengaged with the plate to slidably hold the plate on said edge.

15. In combination with an accordion hav ing a reed block with airopenings therein; a silencer slidable successively in oppositedirections over the air openings to cover and uncover the same; meanscomprising a single continuous connection to actuate said silencer; anda plate slidably mounted adjacent the edge of the keyboard andoperatively connected to the angle continuous connection for sliding thesilencer, said plate being movable successively alon the length of thekeyboard in the same direction from a predetermined position of rest toactuate the silencer.

16. In combination with a reed block of an accordion, of a slidereciprocatable successively in opposite directions on the reed block tochange the octave thereof; means comprising a single continuousconnection to move said slide; and a hand plate adjacent the keyboard ofsaid accordion reciproccatable along the length of the key boardsuccessively, in the same direction to actuate said slide thru saidsingle continuous connection.

17. In combination with a pair of reed blocks of an accordion, of aslide reciprocatable successively, in opposite directions on each reedblock to change the octave of each block; means comprising a singlecontinuous connection to move each slide; and a hand plate adjacent thekeyboard of said accordion reciprocatable along the length of thekeyboard, successively, in one direction from a set position of rest,and in an opposite direction from said set position of rest to actuatethe respective reed block slides thru said means.

18. In combination with a reed block of an accordion, of a slidereciprocatable successively, in opposite directions 011 the reed blockto change the octave thereof; means comprising a single continuousconnection to move said slide; and a hand plate adjacent the keyboard ofsaid accordion and extended substantially the full length thereofreciprocatable along the length of the keyboard, successively, in thesame direction to actuate said slide thru said means.

19. In combination with a pair of reed blocks of an accordion, of aslide reciprocatable, successively, in opposite directions on each reedblock to change the octave of each block; means comprising a singlecontinuous connection to move each slide; and a hand plate adjacent thekeyboard of said accordion and extendel substantially the full lengththereof, reciprocatable along the length of the keyboard, successively,in one direction from a set position of rest and in an oppositedirection from said set position of rest to actuate the respective reedblock slides thru said means.

20. In combination with an accordion having a keyboard thereon and areed block therein, of a slide having a one stroke backward or forwardmovement on the reed block to cover or uncover the reed block openingswhen moved; a hand plate adjacent the keyboard of said accordionextended substantially the full length thereof, having a two strokebackward and forward movement, and a, single continuous connectionbetween the reed block slide and hand plate, adapted to be actuated bythe hand plate to effect a one stroke movement of the reed block slide.

In testimony whereof, I have hereunto set my hand at San Francisco,California, this 14th day of March, 1930.

ANGELO CAGNAZZO.

